Opened book on a stack in front of a blackboard with mathematical formulas

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Size: 6016px × 4016px
Photo credit: © Klaus Ohlenschlaeger / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: amount, blackboard, book, books, browse, chalk, concept, concepts, conceptual, crayon, education, formula, hardcover, learn, learning, material, mathematics, natural, page, pages, people, pile, pitched, quantity, school, schoolbook, schooling, science, scroll, scrolling, stack, symbol, symbolic, symbols, teach, teaching, turn, uni, university